It takes a few days to completely delete all resources in your GCP project.
So some resources are being charged even after project deletion.
First, Restore deleted project.
You can restore deleted project via RESOURCES PENDING DELETION
in manage resource page
Second, Delete your static ip address.
And then delete restored project again.
If you don't want to be charged for resources in deleted project like this case, Make sure to delete resources before project deletion.
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